There are two advantages to using the Chevy dimension rods:
1. They are inexpensive and it's easy to buy a high quality rod for way less than a 440 rod. I believe as there are so many stroker bigblock chevies, the rods have more thought given to using them in strokers, meaning slightly more compact. The 0.990 pins as well have the advantage that there are many lightweight pins to choose from.

2. Because the rod journal is smaller diameter, the outside of the rod is smaller diameter too.

When you think about the total diameter of the rotating assembly, you can fit more stroke using the smaller rod journal. This also lessens or eliminates the amount of work to be done on the block. Example: A 4.15" stroke using a 440 type rod will have a LARGER rotating diameter than a 4.25" crank using a chevy rod.

SO: You could build a 3.91" offset ground stroker using your existing crank and chevy style rods and it for sure wouldn't hit anywhere.

Or, you could build a 4.25" stroke chevy rod engine that'd fit into your block with very minor clearancing on the lower edges of the bores.

You can never go wrong increasing displacement in a car you intend to drive on the street.

R.

PS: Look up the 440Source webpage on strokers and stroker kits. There's a lot of information there.